Cryptic crossword clue
Supplies cut short by supporter for time being 13

The most common and most likely answer to this crossword clue is the 13 letter word PROVISIONALLY

I've seen this crossword clue in The Times
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Buddy explains!

The straight part
We know that "for time being" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case for time being = provisionally.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does PROVISIONALLY mean?

PROVISIONALLY adverb
  1. In a provisional way; temporarily.

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